Dual event nozzle for low opening and high closing pressure inje

Details Dual event nozzle for low opening and high closing pressure inje Dual event nozzle for low opening and high closing pressure inje

1994-09-06

1996-07-09

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Unitary injection nozzle and pump or accumulator plunger

239124, F02M 4702

Patent

active

055336728

ABSTRACT:
In a closed-nozzle fuel injector, an injection timing chamber and an injection chamber and a metering plunger/valve moving in a bore between them. A passage from the injection chamber to the injection spray ports is closed by a needle valve. A piston cup seats one end of a needle valve closing spring, the other end being seated on the needle timing spill passageway is opened by a metering plunger and spills fuel from the injector timing chamber to drive an injection needle-valve-spring-loading-piston away from a rest position toward the spring seat on the valve and apply additional force on the valve-closing-spring at the end of injection. In one embodiment, a passageway from the space above the spring-loading piston to a drain line has an orifice therein to maintain pressure atop the piston to hold the valve closed long enough for combustion pressure in the cylinder to drop before return of the spring seat piston to original rest position. In another embodiment, a ring valve is used, rather than the orificed passageway, to control the rate of spill and thereby maintain pressure for the needed duration. In both embodiments, travel of the piston in a spring loading direction is limited by an abutment shoulder to limit total maximum closing force of the needle valve on the valve seat. Other embodiments positively vent the injection chamber through a restricted passageway to drain during timing fuel spill, for decompression of injection fuel in the injector at the end of injection.

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5,096,121; Grinsteiner; Published Mar. 17, 1992; Grant Withdrawn.

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